DOVER — As investigators continue to search for the body of a 19-year-old University of New Hampshire student, a local man will be arraigned this morning on a second-degree murder charge in relation to her death.

Seth Mazzaglia, 29, of Dover, is set to be arraigned today at 10:45 a.m. at Dover Circuit Court on a second-degree murder charge. Mazzaglia was being held Sunday in the Strafford County House of Corrections pending his first appearance in court.

Attorney General Jane Young announced a ground and water search for the body of Elizabeth “Lizzi” Marriott in the area around Peirce Island in Portsmouth was put on hold Sunday amid dangerous water conditions. She said officials would determine how to continue with the search today.

Assistant Attorney General James Vara announced during a Saturday afternoon press conference that investigators had acquired sufficient evidence to believe Marriott is dead. On Sunday Vara offered “no comment” to several questions, including whether investigators will continue to search for Marriott's body in the area by Peirce Island and whether affidavits pertaining to the case are currently sealed by the Attorney General's office. He cited Mazzaglia's arraignment today as a source for future updates.

Marriott was last seen Tuesday night while at a class at the UNH Durham campus. According to Anthony Hanna, Marriott's uncle, his niece told a friend she was leaving UNH at 9 p.m. and heading to the home of a female friend in Dover on Mill Street. Marriott reportedly never arrived at the home.

Hanna said police have discovered Marriott's phone sent two more transmissions on Tuesday evening — one at about 9:30 p.m. and another at about 10:10 p.m. The last transmission was sent from a cell phone tower in Dover, according to Hanna.

Portsmouth and state police began searching for Marriott's body in the area of Peirce Island and Prescott Park beginning at approximately 7:30 p.m. Friday. Despite a search effort that lasted throughout the night and into Saturday, investigators were unable to locate Marriott's body.

The 27-acre island, which is about 100 feet off the Portsmouth coast, has since been reopened to the public. Vara couldn't elaborate on the information that led investigators to the area around Peirce Island or whether searches would continue in the area.

“We're obviously still searching for her body at this point,” he said Sunday.

During Saturday's press conference, Vara did announce Marriott's vehicle, a 2001 tan colored Mazda Tribute, had been located at a UNH parking lot. He said investigators were still combing the vehicle for additional clues.

Although Vara announced Marriott and Mazzaglia knew other, he didn't elaborate in terms of Mazzaglia's address or place of employment.

Mazzaglia appears to have been the operator of a website located at www.sjmazzaglia.com. The page provides career history for a man named Seth J. Mazzaglia living at 1 Mill St. in Dover. On Saturday, Vara also declined to address whether police presence at an apartment on 1 Mill St. in Dover was linked to Marriott's disappearance.

Marriott, a 2011 graduate of Westborough High School in Massachusetts, was studying marine biology at UNH, according to her uncle. She attended Manchester Community College her freshman year before transferring to UNH this year. She was living with her aunt and uncle this year and commuting to UNH to save money.

State police, FBI agents, and police from UNH, Dover, and Chester have been participating in the search, as well as authorities from Marriott's hometown of Westborough, Mass.

Young said it wasn't immediately clear whether Mazzaglia, who graduated from UNH in 2006, had an attorney. She expected one to be appointed to him during Monday's hearing.

Democrat staff writer Jim Haddadin and the Associated Press contributed to this report.